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This is the dope for drill pipe thread.
这是钻杆丝扣油，不能用在钻铤丝扣上。
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The program is to process all kinds of oil well pipe thread and casing coupling.
该项目是加工各类油井管螺纹、套管接箍的机械加工项目。
Pipe Thread Specification itself with old English system has unreasonable factors.
旧英制管螺纹标准本身存在不合理因素。
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